diff --git a/src/core/libraries/audio/audioin.cpp b/src/core/libraries/audio/audioin.cpp
index 0a2489740..0f3ac4a20 100644
--- a/src/core/libraries/audio/audioin.cpp
+++ b/src/core/libraries/audio/audioin.cpp
@@ -123,7 +123,8 @@ int PS4_SYSV_ABI sceAudioInIsSharedDevice() {
     return ORBIS_OK;
 }
 
-int PS4_SYSV_ABI sceAudioInOpen() {
+int PS4_SYSV_ABI sceAudioInOpen(Libraries::UserService::OrbisUserServiceUserId userId, u32 type,
+                                u32 index, u32 len, u32 freq, u32 param) {
     LOG_ERROR(Lib_AudioIn, "(DUMMY) called");
     return 0x80260005; // ports are full return
 }
diff --git a/src/core/libraries/audio/audioin.h b/src/core/libraries/audio/audioin.h
index 28162d464..96fbc6f3e 100644
--- a/src/core/libraries/audio/audioin.h
+++ b/src/core/libraries/audio/audioin.h
@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <core/libraries/system/userservice.h>
 #include "common/types.h"
 
 namespace Core::Loader {
@@ -11,6 +12,10 @@ class SymbolsResolver;
 
 namespace Libraries::AudioIn {
 
+enum class OrbisAudioInParamFormat : u32 { S16Mono = 0, S16Stereo = 2 };
+
+enum class OrbisAudioInType : u32 { VoiceChat = 0, General = 1, VoiceRecognition = 5 };
+
 int PS4_SYSV_ABI sceAudioInChangeAppModuleState();
 int PS4_SYSV_ABI sceAudioInClose();
 int PS4_SYSV_ABI sceAudioInCountPorts();
@@ -34,7 +39,8 @@ int PS4_SYSV_ABI sceAudioInInit();
 int PS4_SYSV_ABI sceAudioInInput();
 int PS4_SYSV_ABI sceAudioInInputs();
 int PS4_SYSV_ABI sceAudioInIsSharedDevice();
-int PS4_SYSV_ABI sceAudioInOpen();
+int PS4_SYSV_ABI sceAudioInOpen(Libraries::UserService::OrbisUserServiceUserId userId, u32 type,
+                                u32 index, u32 len, u32 freq, u32 param);
 int PS4_SYSV_ABI sceAudioInOpenEx();
 int PS4_SYSV_ABI sceAudioInSetAllMute();
 int PS4_SYSV_ABI sceAudioInSetCompressorPreGain();